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Gerber File Extension Report For: Proto1.GBR format 2:4
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Layer Extension     Layer Description                      
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.GTL                Top Layer                               
.G1                 MidLayer1                               
.G2                 MidLayer2                               
.GBL                Bottom Layer                            
.GTO                Top Overlay                             
.GBO                Bottom Overlay                          
.GTS                Top Solder                              
.GBS                Bottom Solder                           
.GKO                Keep-Out Layer                          
.GTP                Top Pad Master                          
.GBP                Bottom Pad Master                       
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.APR		    Apperture file
.TXT		    NC Drill file 2:4 in ASCII
.DRL		    Camtastic Drill Data (not sure if of any use, but just in case)
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Just in case: Layer Stack-up is in this order: Top-G1-G2-Bottom.

If anything is wrong, contact me! Have a nice day :)

-Jerome Marchand
relaxe@gmail.com